6642668 has 6 divisors (see below), whose sum is σ = 11624676. Its totient is φ = 3321332.

The previous prime is 6642659. The next prime is 6642707. The reversal of 6642668 is 8662466.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830330 + ... + 830337.

It is an arithmetic number, because the mean of its divisors is an integer number (1937446).

Almost surely, 2^6642668 is an apocalyptic number.

It is an amenable number.

6642668 is a deficient number, since it is larger than the sum of its proper divisors (4982008).

6642668 is a wasteful number, since it uses less digits than its factorization.

6642668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660671 (or 1660669 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 6642668 is about 2577.3373857530. The cubic root of 6642668 is about 187.9810981449.

The spelling of 6642668 in words is "six million, six hundred forty-two thousand, six hundred sixty-eight".